Recent Earthquakes in California and Nevada
== PRELIMINARY EVENT REPORT ==
Southern California Seismic Network: a cooperative project of
U.S. Geological Survey, Pasadena California
Caltech Seismological Laboratory, Pasadena, California
Version #6: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro quarry occurred at 1:07:22 PM (PDT) on Friday, September 12, 2025.
The magnitude 0.9 event (a probable quarry explosion) occurred 6 km (4 miles) NE (43 degrees) of Bradbury, CA.
The hypocentral depth is -1 km (-1 miles).
| Magnitude | 0.9 - local magnitude (Ml) |
| Time | Friday, September 12, 2025 at 1:07:22 PM (PDT) Friday, September 12, 2025 at 20:07:22 (UTC) |
| Distance from |
Bradbury, CA - 6 km (4 miles) NE (43 degrees) Azusa, CA - 6 km (4 miles) NNW (345 degrees) Duarte, CA - 7 km (4 miles) NE (42 degrees) Monrovia, CA - 8 km (5 miles) ENE (57 degrees) Glendora, CA - 8 km (5 miles) NW (316 degrees) |
| Coordinates | 34 deg. 11.2 min. N (34.187N), 117 deg. 55.5 min. W (117.925W) |
| Depth | -1.47 km (-0.90 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=11, Nph=11, Dmin=5.6 km, Rmss=0.16 sec, Erho=0.63 km, Erzz=31.61 km, Gp=165 degrees |
| Event ID# | ci41290224 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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